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On the possible 'supersolid' character of parahydrogen clusters

机译:关于对氢簇的可能的“超固体”特征

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We present results of a theoretical study of structural and superfluid properties of parahydrogen (p-H_) clusters comprising 25, 26, and 27 molecules at low temperature. The microscopic model utilized here is based on the Silvera-Goldman pair potential. Numerical results are obtained by means of quantum Monte Carlo simulations, making use of the continuous-space worm algorithm. The clusters are superfluid in the low temperature limit, but display markedly different physical behaviors. For N = 25 and 27, superfluidity at low temperature arises as clusters melt, that is, become progressively liquid-like as a result of quantum effects. On the other hand, for N = 26, the cluster remains rigid and solid-like. We argue that the cluster (p-H_2) _(26) can be regarded as a mesoscopic "supersolid". This physical picture is supported by results of simulations in which a single p-H_2 molecule in the cluster is isotopically substituted.
机译:我们目前对包括25、26和27个分子的对氢(p-H_)团簇在低温下的结构和超流体性质进行理论研究的结果。这里使用的微观模型基于Silvera-Goldman对势。利用连续空间蠕虫算法,通过量子蒙特卡洛模拟获得了数值结果。团簇在低温极限下是超流体,但显示出明显不同的物理行为。对于N = 25和27,当团簇熔化时,即由于量子效应而逐渐变成液体状时,会在低温下产生超流动性。另一方面,对于N = 26,该簇保持刚性和类固体。我们认为聚类(p-H_2)_(26)可以看作是介观的“超固体”。该物理图像得到了模拟结果的支持,其中簇中的单个p-H_2分子被同位素取代。

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